Income taxes.

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Minimum distribution percentage of taxable income to qualify for real estate investment trust.

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- Definition

Tax cuts and jobs act of 2017 enacted date.

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Tax cuts and jobs act of 2017 one time transition tax.

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- Definition

Amount of increase in additional paid in capital (APIC) resulting from a tax benefit associated with share-based compensation plan other than an employee stock ownership plan (ESOP). Includes, but is not limited to, excess tax benefit.

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Percentage of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

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Percentage of domestic federal statutory tax rate applicable to pretax income (loss).

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Amount of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations, attributable to increase (decrease) in the income tax rates.

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The increase (decrease) during the period in the amount due for taxes based on the reporting entity's earnings or attributable to the entity's income earning process (business presence) within a given jurisdiction.

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Amount recognized for uncertainty in income taxes classified as current.

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Income Taxes - Additional Information (Detail) - USD ($)	3 Months Ended		12 Months Ended
	Sep. 30, 2018	Dec. 31, 2017	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Income Taxes [Line Items]
Minimum Distribution Percentage of Taxable Income to Qualify for Real Estate Investment Trust			90.00%
TCJA enacted date			Dec. 22, 2017
U.S. federal corporate tax rate			21.00%	35.00%	35.00%
TCJA one time transition tax			$ 0
Effect of change in income tax associated with the ACT	$ 1,000,000	$ 4,500,000
Tax benefits associated with equity-based compensation					$ 1,479,000
Increase (decrease) in income taxes payable			$ (846,000)	$ 948,000	$ 1,645,000
Effective tax rate			5.00%	7.20%	3.60%
Liabilities for uncertain tax positions		$ 0	$ 0	$ 0
ASU 2016-09
Income Taxes [Line Items]
Increase (decrease) in income taxes payable			$ 800,000	$ (1,000,000)